Correct option is A
In a certain code language,
A ? B means ‘A is the daughter of B’,
A = B means ‘A is the son of B’,
A @ B means ‘A is the father of B’ and
A √ B means ‘A is the sister of B’.
How is C related to L if 'C = D @ E √ F ? L'?

C is Son of L .